What action must crew members take after a non-passenger train stops due to an emergency application of the brakes?

Providing flag protection in both directions on all main tracks is critical to ensuring safety after a non-passenger train stops due to an emergency brake application. When an emergency stop occurs, there is an increased risk of trains approaching from either direction. By implementing flag protection in both directions, crew members create a safety buffer and allow for the prevention of potential collisions or accidents.

This approach complies with safety protocols that prioritize the well-being of personnel, trains, and infrastructure. It ensures that any other trains operating in the vicinity are adequately warned and can take appropriate action to avoid the disabled train.

The necessity of providing protection in both directions emphasizes the unpredictable nature of rail operations and reinforces the need for comprehensive safety measures. In contrast, options that suggest flagging in only one direction, notifying the dispatcher before leaving the train, or resuming normal operations immediately do not adequately address the risks associated with a stopped train, thus failing to uphold safety standards.